Mixing tank



J. A. WHITE MIXING TANK Jan. 1, 1929. 1,696,994

Filed May 1923 2 Sheets-Sheet l n w #"J- Jan. 1, 1929. 1,696,994

J. A. WHITE MIXING TANK Filed May 1923 2 Sheets-Sheet 2 Patented Jan. 1, 1929.

ETED STATES PATENT OFFICE.

JOSEPH A. WHITE, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO GBELLET COLLINS, 0F PHILADELPHIA, PENNSYLVANIA.

MIXING: TANK.

Application aleama 8, 923. Serial No. 637,505.

This invention relates to certain improvement-s in apparatus for mixin or bleaching paper stock. at,

One object of the invention is to construct the tank so that all portions of the material will be in circulation,

A further object of the invention is to provide means for separating the upward currents of paper stock so that the stock will fall readily to the center for re-circulat-ion.

In the accompanying drawings:

Fig. 1 is a Vertical sectional view through my improved mixing tank;

Fig. 2 is a sectional plan view on the line 22, Fig. 1;

Fig. 3 is a perspective view of one of the arms;

Fig. tis a diagrammatic view showing the separation of the paper stock in its upward movement through the tank; and t Fig. 5 is a,v view illustrating a modification of the invention.

Referring to the drawings, 1 is the tank made of concrete in the present instance and having a bottom portion 2 and sides 3, 3.

These sides are tapered inwards from the line a: tothe upper end of the tank so that the diameter of the tank. is greater at the bottom than at the top. The interior corners 4 of the tank are rounded, as shown, which pre vent any eddies in the circulation of the stock. The tank is cylindrical in cross section, as shown clearly in Fig. 2.

Extending vertically through the center of the tank is .a shaft 5 mounted in a step bearing 6, resting on the bottom of the tank. The bearing is enclosed within av plate 7, beveled towards the periphery, as shown. This plate acts as an abutment for the stock in its downward movement. As the plate is beveled, it has a tendency to force\the stock away from the center of the tank.

Securely mounted on the lower end of the shaftfi is a worm 8. Surrounding this worm is a fixed cylinder 9 spaced some distance from the bottom of the tank, as shown clearly in Fig. 1. This cylinder is supported by four arms 10, in the present instance, which are flanged at 11 and are secured to the body of the tank by bolts 12, or other fastenings. The shaft 5 is rotated in the direction of the arrow so as to'cause the worm to feed the stock at the center of the tank down through the cylinder 9. The stock escapes from under the cylinder and passes to the outer portion of the tank where it moves upwards, as indicated by the arrows. The shaft 5 has a bevel wheel 13, which meshes with a pinion 14 on a driving shaft 15, mounted in bearings 16. The upper end of the shaft 5 is also mounted in a bearing 17 and the bearings are supported by a beam 18 resting on the upper end of the tank. If desired, the supplementary worms 19 and 20 may be mounted on the shaft above the worm 8. The cylinder 9, however, need not be of a length to enclose these additional worms, as the paper stock, which is moving upwards, forms a wall. As the stock flows upwards, the arms separate the stock into segmental sections. This is .important, as the stock is of such density ter of the tank to be recirculated as, soon as released from under the cylinder 9.

Water may be added to the stock through a pipe 22 at the bottom of the tank, or it may be admitted to the upper end of the tank by any suitable pipe. The pipe 22 connects with an annular spray nozzle 23, which surrounds the outlet pipe 24, which is closed by a valve 25 actuated through a hand wheel 26 at the side of the tank through worm mechanism 27 and lever 28. This valve mechanism is of the ordinary construction.

While my invention is used particularly for mixing and bleaching paper stock, it can also be used in the stuif chest of a paper making machine for circulating stock, or other semi-liquid materials. 9

Fig. 5illustrates a modification of the in- CPI eeaeea means for driving the shaft; and two Worms 10 on the shaft, said Worms being spaced apart, one worm being located within the cylinder and the other Worm being located some distance above the cylinder, the shaft being driven in a direction to cause the Wet stock to circulate downwards through the cylinder,

JOSEPH A. WHITE. 

